/**
* Copyright (C) 2013-2024 Nanjing Pengyun Network Technology Co., Ltd.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
*     http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/ 

package py.datanode.segment.datalog.sync.log.reduce;

public interface ReduceBuilder<U, M> {
  boolean submitUnit(U unit);

  boolean submitUnit(U unit, boolean force);

  /**
   * build a instance of type M, it pack all unit of type U which submit to this builder.
   *
   */
  M build();

  /**
   * if cache has been expired, validity begins with creation. a timer will call this function.
   *
   */
  M expiredBuild();

}

